“Introduction.” Charming Proofs: A Journey into Elegant Mathematics, by Claudi Alsina and Roger B. Nelsen, 1st ed., vol. 42, Mathematical Association of America, 2010, pp. xix-xxiv, www.jstor.org/stable/10.4169/j.ctt6wpwnz.4. Accessed 3 Aug. 2020.
Alsina, C., & Nelsen, R. (2010). Introduction. In Charming Proofs: A Journey into Elegant Mathematics (pp. Xix-Xxiv). Mathematical Association of America. Retrieved August 3, 2020, from www.jstor.org/stable/10.4169/j.ctt6wpwnz.4
Alsina, Claudi, and Roger B. Nelsen. "Introduction." In Charming Proofs: A Journey into Elegant Mathematics, Xix-xiv. Mathematical Association of America, 2010. Accessed August 3, 2020. www.jstor.org/stable/10.4169/j.ctt6wpwnz.4.
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